MD59-0054 M/A-COM, Inc., MD59-0054 Datasheet - Page 4

• Manufacturer Part Number: MD59-0054
• Description: Cellular Upconverter/driver 824-849 MHZ
• Manufacturer: M/A-COM, Inc.

Specifications subject to change without notice.
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Visit www.macom.com for additional data sheets and product information.
Cellular Upconverter/Driver, 824 - 849 MHz
North America: Tel. [phone],
Asia/Pacific: Tel.[phone], Fax [phone]
Europe: Tel. [phone], Fax[phone]
Operating Instructions
The MD59-0054 is a fully integrated upconverter / driver
IC for the 824 – 849 MHz cellular frequency band. It
includes a differential IF amplifier, a balanced mixer, an
LO buffer amplifier, a RF amplifier, a voltage variable
attenuator, and a driver amplifier. It also has a power
down mode that turns off the current to the part to
conserve power when the part is not in use. The part is set
in a miniature 4-mm plastic FQFP-N 20-lead package
where the backside of the lead frame is exposed to
facilitate excellent RF grounding and thermal transfer.
The user must add surface mount resistors, inductors and
capacitors are used in conjunction with the IC to optimize
the trade-offs among performance, tunability and ease of
use. The test board schematic provided shows the MMIC
and required off-chip component values.
The IFA is a differential pair of single-stage, common
source DFET amplifiers. An internal self-biasing resistor
in the source is used to set a nominal current of 10 mA (5
mA per amplifier). The input impedance of the IFA is
matched externally to 50 ohms at the desired IF frequency
with L3, C3 and C4. In addition, C3 and C4 also act as
DC blocking capacitors for the differential IF inputs. An
external 4:1 transformer can be used to test the device in a
single ended 50-ohm system. Inductors L1 and L2 help
match the output of the differential IF amplifier to the
differential input of the mixer, as well as providing RF
chokes for the DC supply lines. The capacitor C5 is a low
frequency bypass capacitor for the DC supply line and
should be placed as close to the device as is practical.
The LOA is an EFET / DFET cascode amplifier that
provides the voltage gain required to drive the gate of the
mixer FET while drawing only 3 mA of current
nominally. The input port is matched on chip to 50 ohms
Place components C1 and C2, RF and low frequency
bypass capacitors for the DC supply line, as close to the
device as practical.
The mixer is a balanced floating FET mixer that provides
exceptional linearity and isolation with low loss and
consumes no DC current. The mixer uses a high-side LO
frequency.
between the mixer output and driver input to prevent
upconversion noise at the image frequency leaking onto
the RF. The filter used should have a 50-ohm input and
output impedance.
The RFA is a single stage, common source EFET
amplifier. The topology of both the input and output
matching networks for the RF amplifier provides internal
DC blocking capacitors to prevent unwanted DC leakage.
An external image reject filter is required
Place components C13 and C14, RF and low frequency
bypass capacitors for the DC supply line as close to the
device as practical.
The voltage variable attenuator (VVA) has a double-T
topology and provides better than 30 dB of attenuation
range.
attenuation. Capacitor C11 is a bypass capacitor used to
provide RF ground to the shunt legs of the attenuator.
The driver amplifier is a two-stage, common source
DFET amplifier. Both stages use a self-biasing resistor
in their source path to set their bias point. The self-
biasing resistor for the first stage is internal and has
been chosen for a nominal current of 5 mA. Select the
external, self-biasing resistor for the second stage, R1,
for a nominal current of 25 mA. You can also select the
value of R1 can to adjust the bias current of the second
stage, thereby adjusting the driver’s linear output
power. Components C7, C8, C9 and C10 are RF and
low frequency bypass capacitors for the DC supply.
Components C12 and C6 are the source bypass
capacitors for the first and second stages of the driver
respectively.
device as practical.
Use the VVA_Ctrl input to set the desired
Place these capacitors as close to the
MD59-0054
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